Ok guys so the non Ford dealership i bought my 2005 f350 turbo diesel dully from cant find the problem nor can a shop they have sent it to, its been 5 months since i bought it and its had the same problem (which they said was not a problem they would fix it). The truck is constantly surging / lunging at constant speed weather it be 45 55 65 75....... it also slams VERY hard into gear and over revs just before slamming into the gear. they have changed sensors, cleaned the turbo, changed the wiring harness.... Need help